546 PROCEEDINGS OF THE NATIONAL MUSEUM vol. i06 



Family Dipodidae 

 Subfamily Dipodinae 



Jaculus jaculus butleri Thomas 



Figure 8,d 



Jaculus jaculus butleri Thomas, Ann. Mag. Nat. Hist., ser. 9, vol. 9, p. 296, 

 April 1922. (Khartoum.) 



Specimen's Examined: Forty-three, all in BM, from: Khartoum, 

 22 ; Port Sudan, 6 ; Khor iVrbat, 1 ; Sinkat, 1 ; Khor Hanoieit, 2 ; Shendy, 

 3 ; Kerma, 3 ; Omdurman, 1 ; Sennaar, 2 ; eastern Egyptian Desert, 

 lat. 21°3r N., long. 35° E., 1; Merowe, 1. 



Measurements: No external measurements are available, but 

 cranial measurements of an adult male and averages and extremes of 

 three adult females from Khartoum are, respectively, as follows: 

 Greatest length of skull 32.7, 33.0 (32.7-33.5); condyloincisive length 

 28.8, 28.9 (28.5-29.4); crown length of upper toothrow 4.7, 4.6 

 (4.5-4.7); greatest breadth across anterior zygomatic processes 23.4, 

 24.2 (24.2); least interorbital width 11.8, 12.0 (11.8-12.2); length of 

 nasals 12.0, 12.2 (11.8-12.7); width of rostrum at level of antorbital 

 foramen 5.1, 5.3 (5.0-5.5); greatest breadth of braincase 22.4, 22.9 

 (22.4-23.3). 



Remarks : This subspecies differs from Jaculus jaculus gordoni in 

 somewhat darker color, that is, more admixture of black tipped hairs; 

 smaller hind foot; and a decidedly shorter ear. The skulls are quite 

 similar except that the auditor}^ bullae are smaller, the upper cheek- 

 teeth smaller and the toothrow shorter, the rostrum somewhat 

 narrower and shorter, and the lachrymals somewhat larger. 



Jaculus jaculus gordoni Thomas 



Figure 8,f/ 



Jaculus gordoni Thomas, Proc. Zool. Soc. Loudon, p. 299, Aug. 6, 1903. (Kaga 

 Hills, Western Kordofan.) 



Specimens Examined: Thirteen, all in BM, from: Kaga Hills, 2; 

 Jebel Um Durragh, 1; Jebel Agageh, 1; Hamra, 5; Haraza, 2; near 

 El Fasher, 1; 55 miles northeast of El Fasher, 1. 



Measurements: The type, an adult male, measures as follows: 

 Length of head and body 120; length of tail 200; length of hind foot 66; 

 length of ear 25; gi-eatest length of skull 35.5; condyloincisive length 

 31.9; crown length of upper toothrow 5.6; greatest breadth across 

 anterior zj-gomatic processes 24.1 ; least interorbital width 13.0; length 

 of nasals 13.0; width of rostrum at level of antorbital foramen 6.0; 

 greatest breadth of braincase 24.5. 



